The first shows Estonia's Narva Bridge, the first built to span the river was in 1869, a stronger one had to be built next to it in 1902 but was destroyed in World War I. A new rail bridge, and the last iron bridge built in Estonia, was opened in December 1923 (162 metres) but destroyed in World War II as indeed was most of the city of Narva by either the Russians or the Germans. (I can't work out whether they have rebuilt this bridge or replaced it as all the photos I've found seem to show a different shape). However I am sure about the sparklingly new Swiss built Stadler FLIRT passenger train shown on the stamp which Estonia had ordered to replace their old trains and expected to be in use soon after the stamp issue but they eventually all came into service in 2013.
The middle stamp is Latvia's Carnikava Bridge, a metal bridge over the Gauja built in 1950 (220.8 metres). A rather nice picture showing it in context appears on Panoramio here
Lastly is Lithuania's longest and highest bridge, the Lyduvinai shown with an equally long goods train. This stamp issue links three countries but the next stamp shows a bridge directly linking two countries
|Buchs to Schaan Bridge|
Who would guess that from this peaceful view?.
An entry to Sunday Stamps II theme - Bridges to Anywhere - cross over here to see more.